Method for quantifying solute transport multi-scale characteristics in complex medium
A multi-scale feature and solute transport technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problems of inability to describe multi-scale features, large amount of calculation, inconvenient engineering application, etc., and achieve a wide range of engineering applications Foreground, the effect of being convenient for engineering use
Active Publication Date: 2018-08-28
HOHAI UNIV
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[0005] The above-mentioned existing patented technology methods can only describe the single-scale characteristics of non-Fickian migration in complex media, and cannot describe multi-scale characteristics
At present, some methods can describe the multi-scale characteristics of solute non-Fick transport in complex media, such as variable order fractal derivative model, variable order fractional derivative model, random order fractional derivative model, distribution order fractional derivative model etc., but these methods are more complex and require a large amount of calculation, which is not convenient for engineering application
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[0047] 1. In this embodiment, saturated Euclidean porous media and fractal porous media are selected as the research objects. The internal pore diameter of Euclidean porous media is uniformly distributed, and that of fractal porous media is non-uniformly distributed. The relationship between inhomogeneity and porosity in Euclidean porous media and fractal porous media see figure 2 . By examining the migration trajectory of 100 solute particles in the medium, the migration time is 1000 incremental steps, the size of the medium is 1000x1000 unit cells, and the smallest unit cell is 10 -6 , the porosity is 0.5, the mean square displacement R of the solute particles in the two porous media is obtained, see respectively image 3 .
[0048] 2. Use the multi-scale mobility 2 (t)>=-Ddilog(t) / c describes the mean square displacement of solute migration in Euclidean porous media, and combined with the mean square displacement data calculated in step (2), investigate Euclidean porous ...
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The invention discloses a method for quantifying solute transport multi-scale characteristics in a complex medium. The method comprises the steps of selecting a solute transport process in a concretecomplex medium as a research object, determining a test condition, observing a movement trajectory of a solute particle to obtain test data R of a mean square displacement of the solute particle, wherein R is a set of average values of distances between positions x of all particle at the t moment and respective initial point when the movement time is t; deducing a multi-scale transport rate of thesolute transport according to a distributed step fractal derivation model or an equivalent form thereof; calculating a value of a parameter c in the multi-scale transport rate in combination with thetest data R of the mean square displacement of the solute particle; and obtaining multi-scale characteristics of the solute transport in the complex medium according to the value of the parameter c,and classifying the solute transport process. The method for quantifying the solute transport multi-scale characteristics in the complex medium has broad engineering application prospects, can be usedfor prediction, assessment and management of pollutant transport. Compared with an existing model or technology, the method is more convenient for engineering use.
Description
technical field [0001] The invention relates to a calculation method for mesoscale characteristics of environmental fluids, in particular to a method for quantifying multiscale characteristics of solute migration in complex media. Background technique [0002] The migration process of pollutants in complex media such as soil, fractured rock mass, and concrete is an important engineering problem in the field of environmental fluids, such as deep geological storage of nuclear waste, infiltration of sewage in landfills, and aging of oil pipelines. Seepage, seawater intrusion, etc. lead to serious pollution of groundwater. Clarifying the law of solute migration in complex media can provide effective methods for the control of pollutant migration process, the restoration and treatment of polluted water and soil, and the rational development and sustainable utilization of natural resources. [0003] Usually, the complex medium is heterogeneous and anisotropic, and the movement of...
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IPC IPC(8): G06F17/50G06K9/62
CPCG06F30/20G06F18/24
Inventor 梁英杰徐伟董天驰孔洲李驿聪梁国督
Owner HOHAI UNIV
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